Police recovered fragments of internet chats from an Aberdeen doctor's computer, which requested indecent images of teenagers, a trial has heard.
Douglas Harris, 29, is alleged to have taken, permitted to be taken or made indecent images, as well as being in possession of pictures.
Forensic computer analyst Ronald Findlay told Aberdeen Sheriff Court he found evidence of teenage nudity sites.
Mr Harris denies the charges.
He has lodged special defences of incrimination and alibi.
Mr Harris claims someone else could have been responsible for downloading the images.
Mr Findlay said logs showed the user chatting to another person online.
The court heard the user said: "You got any more teen?"
'Downloaded by paedophiles'
The court heard the other person replied: "Not a lot."
Depute fiscal Neil Shand asked: "Based on the context of that conversation, would you say that appears consistent for requests of indecent images of teenagers?"
Mr Findlay replied: "Yes."
The court heard other online chats made sexual references to girls.
Internet sites "commonly downloaded by paedophiles" were found, Mr Findlay said.
The offences are alleged to have happened between 2004 and 2006.
The trial continues on Monday.